Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1d58d2fb4e18a2cf3f82f3bfb731a57f587f4d4df1a3615a68ba68a99e52ac' 
  AND token = 'r7daIjRasUM5LxW3j6m58p/Hh39zG2+AjpjSxNBn9UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}